The force which acts along the radius of a circle and directed towards its centre is known as

58) The quantum of force that produces an acceleration of 1 m/ square second on a mass of one kg, in the direction of which it acts is equal to

59) Which of the following types of energy is possed by a tighly wound watch spring?

60) The total energy possed by a system of moving bodies is

61) A body with mass 1200 kg is located on a 10 degrees inclined plane. What is the pulling force without friction?